CVE-2026-70461Network attack vector

Unauthenticated heap corruption via files-from entry

Published Aug 13, 2026 · Updated Aug 13, 2026

Heap out-of-bounds write in Rsync Project rsync 3.2.5 through 3.4.4 allows remote attackers to corrupt heap memory via files-from input. The add_implied_include() function under-counts a trailing backslash while sizing an implied filter rule, then writes the peer-supplied byte beyond the allocation. An unauthenticated client reaches this path through a standard read-only daemon module; no write access or crafted protocol is required, and code execution is not claimed.

CVSS severity8.8
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds write in Rsync Project rsync 3.2.5 through 3.4.4 allows remote attackers to corrupt heap memory via files-from input. The add_implied_include() function under-counts a trailing backslash while sizing an implied filter rule, then writes the peer-supplied byte beyond the allocation. An unauthenticated client reaches this path through a standard read-only daemon module; no write access or crafted protocol is required, and code execution is not claimed.

The record

CVE
CVE-2026-70461
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Rsync Project
Product
rsync
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2.5 <=3.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rsync Project · rsyncversion=3.2.5 <=3.4.4

Published CVSS scores

8.2Rsync ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
8.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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